/* $NetBSD: log.c,v 1.1.4.2 2024/02/29 11:39:01 martin Exp $ */ /* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * SPDX-License-Identifier: MPL-2.0 * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, you can obtain one at https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ /*! \file */ #include #include #include #include #include #include /* dev_t FreeBSD 2.1 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define LCTX_MAGIC ISC_MAGIC('L', 'c', 't', 'x') #define VALID_CONTEXT(lctx) ISC_MAGIC_VALID(lctx, LCTX_MAGIC) #define LCFG_MAGIC ISC_MAGIC('L', 'c', 'f', 'g') #define VALID_CONFIG(lcfg) ISC_MAGIC_VALID(lcfg, LCFG_MAGIC) #define RDLOCK(lp) RWLOCK(lp, isc_rwlocktype_read); #define WRLOCK(lp) RWLOCK(lp, isc_rwlocktype_write); #define RDUNLOCK(lp) RWUNLOCK(lp, isc_rwlocktype_read); #define WRUNLOCK(lp) RWUNLOCK(lp, isc_rwlocktype_write); /* * XXXDCL make dynamic? */ #define LOG_BUFFER_SIZE (8 * 1024) /*! * This is the structure that holds each named channel. A simple linked * list chains all of the channels together, so an individual channel is * found by doing strcmp()s with the names down the list. Their should * be no performance penalty from this as it is expected that the number * of named channels will be no more than a dozen or so, and name lookups * from the head of the list are only done when isc_log_usechannel() is * called, which should also be very infrequent. */ typedef struct isc_logchannel isc_logchannel_t; struct isc_logchannel { char *name; unsigned int type; int level; unsigned int flags; isc_logdestination_t destination; ISC_LINK(isc_logchannel_t) link; }; /*! * The logchannellist structure associates categories and modules with * channels. First the appropriate channellist is found based on the * category, and then each structure in the linked list is checked for * a matching module. It is expected that the number of channels * associated with any given category will be very short, no more than * three or four in the more unusual cases. */ typedef struct isc_logchannellist isc_logchannellist_t; struct isc_logchannellist { const isc_logmodule_t *module; isc_logchannel_t *channel; ISC_LINK(isc_logchannellist_t) link; }; /*! * This structure is used to remember messages for pruning via * isc_log_[v]write1(). */ typedef struct isc_logmessage isc_logmessage_t; struct isc_logmessage { char *text; isc_time_t time; ISC_LINK(isc_logmessage_t) link; }; /*! * The isc_logconfig structure is used to store the configurable information * about where messages are actually supposed to be sent -- the information * that could changed based on some configuration file, as opposed to the * the category/module specification of isc_log_[v]write[1] that is compiled * into a program, or the debug_level which is dynamic state information. */ struct isc_logconfig { unsigned int magic; isc_log_t *lctx; ISC_LIST(isc_logchannel_t) channels; ISC_LIST(isc_logchannellist_t) * channellists; unsigned int channellist_count; unsigned int duplicate_interval; int_fast32_t highest_level; char *tag; bool dynamic; }; /*! * This isc_log structure provides the context for the isc_log functions. * The log context locks itself in isc_log_doit, the internal backend to * isc_log_write. The locking is necessary both to provide exclusive access * to the buffer into which the message is formatted and to guard against * competing threads trying to write to the same syslog resource. (On * some systems, such as BSD/OS, stdio is thread safe but syslog is not.) * Unfortunately, the lock cannot guard against a _different_ logging * context in the same program competing for syslog's attention. Thus * There Can Be Only One, but this is not enforced. * XXXDCL enforce it? * * Note that the category and module information is not locked. * This is because in the usual case, only one isc_log_t is ever created * in a program, and the category/module registration happens only once. * XXXDCL it might be wise to add more locking overall. */ struct isc_log { /* Not locked. */ unsigned int magic; isc_mem_t *mctx; isc_logcategory_t *categories; unsigned int category_count; isc_logmodule_t *modules; unsigned int module_count; atomic_int_fast32_t debug_level; isc_rwlock_t lcfg_rwl; /* Locked by isc_log lcfg_rwl */ isc_logconfig_t *logconfig; isc_mutex_t lock; /* Locked by isc_log lock. */ char buffer[LOG_BUFFER_SIZE]; ISC_LIST(isc_logmessage_t) messages; atomic_bool dynamic; atomic_int_fast32_t highest_level; }; /*! * Used when ISC_LOG_PRINTLEVEL is enabled for a channel. */ static const char *log_level_strings[] = { "debug", "info", "notice", "warning", "error", "critical" }; /*! * Used to convert ISC_LOG_* priorities into syslog priorities. * XXXDCL This will need modification for NT. */ static const int syslog_map[] = { LOG_DEBUG, LOG_INFO, LOG_NOTICE, LOG_WARNING, LOG_ERR, LOG_CRIT }; /*! * When adding new categories, a corresponding ISC_LOGCATEGORY_foo * definition needs to be added to . * * The default category is provided so that the internal default can * be overridden. Since the default is always looked up as the first * channellist in the log context, it must come first in isc_categories[]. */ LIBISC_EXTERNAL_DATA isc_logcategory_t isc_categories[] = { { "default", 0 }, /* "default must come first. */ { "general", 0 }, { NULL, 0 } }; /*! * See above comment for categories on LIBISC_EXTERNAL_DATA, and apply it to * modules. */ LIBISC_EXTERNAL_DATA isc_logmodule_t isc_modules[] = { { "socket", 0 }, { "time", 0 }, { "interface", 0 }, { "timer", 0 }, { "file", 0 }, { "netmgr", 0 }, { "other", 0 }, { NULL, 0 } }; /*! * This essentially constant structure must be filled in at run time, * because its channel member is pointed to a channel that is created * dynamically with isc_log_createchannel. */ static isc_logchannellist_t default_channel; /*! * libisc logs to this context. */ LIBISC_EXTERNAL_DATA isc_log_t *isc_lctx = NULL; /*! * Forward declarations. */ static void assignchannel(isc_logconfig_t *lcfg, unsigned int category_id, const isc_logmodule_t *module, isc_logchannel_t *channel); static void sync_channellist(isc_logconfig_t *lcfg); static void sync_highest_level(isc_log_t *lctx, isc_logconfig_t *lcfg); static isc_result_t greatest_version(isc_logfile_t *file, int versions, int *greatest); static void isc_log_doit(isc_log_t *lctx, isc_logcategory_t *category, isc_logmodule_t *module, int level, bool write_once, const char *format, va_list args) ISC_FORMAT_PRINTF(6, 0); /*@{*/ /*! * Convenience macros. */ #define FACILITY(channel) (channel->destination.facility) #define FILE_NAME(channel) (channel->destination.file.name) #define FILE_STREAM(channel) (channel->destination.file.stream) #define FILE_VERSIONS(channel) (channel->destination.file.versions) #define FILE_SUFFIX(channel) (channel->destination.file.suffix) #define FILE_MAXSIZE(channel) (channel->destination.file.maximum_size) #define FILE_MAXREACHED(channel) (channel->destination.file.maximum_reached) /*@}*/ /**** **** Public interfaces. ****/ /* * Establish a new logging context, with default channels. */ void isc_log_create(isc_mem_t *mctx, isc_log_t **lctxp, isc_logconfig_t **lcfgp) { isc_log_t *lctx; isc_logconfig_t *lcfg = NULL; REQUIRE(mctx != NULL); REQUIRE(lctxp != NULL && *lctxp == NULL); REQUIRE(lcfgp == NULL || *lcfgp == NULL); lctx = isc_mem_get(mctx, sizeof(*lctx)); lctx->mctx = NULL; isc_mem_attach(mctx, &lctx->mctx); lctx->categories = NULL; lctx->category_count = 0; lctx->modules = NULL; lctx->module_count = 0; atomic_init(&lctx->debug_level, 0); ISC_LIST_INIT(lctx->messages); isc_mutex_init(&lctx->lock); isc_rwlock_init(&lctx->lcfg_rwl, 0, 0); /* * Normally setting the magic number is the last step done * in a creation function, but a valid log context is needed * by isc_log_registercategories and isc_logconfig_create. * If either fails, the lctx is destroyed and not returned * to the caller. */ lctx->magic = LCTX_MAGIC; isc_log_registercategories(lctx, isc_categories); isc_log_registermodules(lctx, isc_modules); isc_logconfig_create(lctx, &lcfg); sync_channellist(lcfg); lctx->logconfig = lcfg; atomic_init(&lctx->highest_level, lcfg->highest_level); atomic_init(&lctx->dynamic, lcfg->dynamic); *lctxp = lctx; if (lcfgp != NULL) { *lcfgp = lcfg; } } void isc_logconfig_create(isc_log_t *lctx, isc_logconfig_t **lcfgp) { isc_logconfig_t *lcfg; isc_logdestination_t destination; int level = ISC_LOG_INFO; REQUIRE(lcfgp != NULL && *lcfgp == NULL); REQUIRE(VALID_CONTEXT(lctx)); lcfg = isc_mem_get(lctx->mctx, sizeof(*lcfg)); lcfg->lctx = lctx; lcfg->channellists = NULL; lcfg->channellist_count = 0; lcfg->duplicate_interval = 0; lcfg->highest_level = level; lcfg->tag = NULL; lcfg->dynamic = false; ISC_LIST_INIT(lcfg->channels); lcfg->magic = LCFG_MAGIC; /* * Create the default channels: * default_syslog, default_stderr, default_debug and null. */ destination.facility = LOG_DAEMON; isc_log_createchannel(lcfg, "default_syslog", ISC_LOG_TOSYSLOG, level, &destination, 0); destination.file.stream = stderr; destination.file.name = NULL; destination.file.versions = ISC_LOG_ROLLNEVER; destination.file.suffix = isc_log_rollsuffix_increment; destination.file.maximum_size = 0; isc_log_createchannel(lcfg, "default_stderr", ISC_LOG_TOFILEDESC, level, &destination, ISC_LOG_PRINTTIME); /* * Set the default category's channel to default_stderr, * which is at the head of the channels list because it was * just created. */ default_channel.channel = ISC_LIST_HEAD(lcfg->channels); destination.file.stream = stderr; destination.file.name = NULL; destination.file.versions = ISC_LOG_ROLLNEVER; destination.file.suffix = isc_log_rollsuffix_increment; destination.file.maximum_size = 0; isc_log_createchannel(lcfg, "default_debug", ISC_LOG_TOFILEDESC, ISC_LOG_DYNAMIC, &destination, ISC_LOG_PRINTTIME); isc_log_createchannel(lcfg, "null", ISC_LOG_TONULL, ISC_LOG_DYNAMIC, NULL, 0); *lcfgp = lcfg; } void isc_logconfig_use(isc_log_t *lctx, isc_logconfig_t *lcfg) { isc_logconfig_t *old_cfg; REQUIRE(VALID_CONTEXT(lctx)); REQUIRE(VALID_CONFIG(lcfg)); REQUIRE(lcfg->lctx == lctx); /* * Ensure that lcfg->channellist_count == lctx->category_count. * They won't be equal if isc_log_usechannel has not been called * since any call to isc_log_registercategories. */ sync_channellist(lcfg); WRLOCK(&lctx->lcfg_rwl); old_cfg = lctx->logconfig; lctx->logconfig = lcfg; sync_highest_level(lctx, lcfg); WRUNLOCK(&lctx->lcfg_rwl); isc_logconfig_destroy(&old_cfg); } void isc_log_destroy(isc_log_t **lctxp) { isc_log_t *lctx; isc_logconfig_t *lcfg; isc_mem_t *mctx; isc_logmessage_t *message; REQUIRE(lctxp != NULL && VALID_CONTEXT(*lctxp)); lctx = *lctxp; *lctxp = NULL; mctx = lctx->mctx; /* Stop the logging as a first thing */ atomic_store_release(&lctx->debug_level, 0); atomic_store_release(&lctx->highest_level, 0); atomic_store_release(&lctx->dynamic, false); WRLOCK(&lctx->lcfg_rwl); lcfg = lctx->logconfig; lctx->logconfig = NULL; WRUNLOCK(&lctx->lcfg_rwl); if (lcfg != NULL) { isc_logconfig_destroy(&lcfg); } isc_rwlock_destroy(&lctx->lcfg_rwl); isc_mutex_destroy(&lctx->lock); while ((message = ISC_LIST_HEAD(lctx->messages)) != NULL) { ISC_LIST_UNLINK(lctx->messages, message, link); isc_mem_put(mctx, message, sizeof(*message) + strlen(message->text) + 1); } lctx->buffer[0] = '\0'; lctx->categories = NULL; lctx->category_count = 0; lctx->modules = NULL; lctx->module_count = 0; lctx->mctx = NULL; lctx->magic = 0; isc_mem_putanddetach(&mctx, lctx, sizeof(*lctx)); } void isc_logconfig_destroy(isc_logconfig_t **lcfgp) { isc_logconfig_t *lcfg; isc_mem_t *mctx; isc_logchannel_t *channel; char *filename; unsigned int i; REQUIRE(lcfgp != NULL && VALID_CONFIG(*lcfgp)); lcfg = *lcfgp; *lcfgp = NULL; /* * This function cannot be called with a logconfig that is in * use by a log context. */ REQUIRE(lcfg->lctx != NULL); RDLOCK(&lcfg->lctx->lcfg_rwl); REQUIRE(lcfg->lctx->logconfig != lcfg); RDUNLOCK(&lcfg->lctx->lcfg_rwl); mctx = lcfg->lctx->mctx; while ((channel = ISC_LIST_HEAD(lcfg->channels)) != NULL) { ISC_LIST_UNLINK(lcfg->channels, channel, link); if (channel->type == ISC_LOG_TOFILE) { /* * The filename for the channel may have ultimately * started its life in user-land as a const string, * but in isc_log_createchannel it gets copied * into writable memory and is not longer truly const. */ DE_CONST(FILE_NAME(channel), filename); isc_mem_free(mctx, filename); if (FILE_STREAM(channel) != NULL) { (void)fclose(FILE_STREAM(channel)); } } isc_mem_free(mctx, channel->name); isc_mem_put(mctx, channel, sizeof(*channel)); } for (i = 0; i < lcfg->channellist_count; i++) { isc_logchannellist_t *item; while ((item = ISC_LIST_HEAD(lcfg->channellists[i])) != NULL) { ISC_LIST_UNLINK(lcfg->channellists[i], item, link); isc_mem_put(mctx, item, sizeof(*item)); } } if (lcfg->channellist_count > 0) { isc_mem_put(mctx, lcfg->channellists, lcfg->channellist_count * sizeof(ISC_LIST(isc_logchannellist_t))); } lcfg->dynamic = false; if (lcfg->tag != NULL) { isc_mem_free(lcfg->lctx->mctx, lcfg->tag); } lcfg->tag = NULL; lcfg->highest_level = 0; lcfg->duplicate_interval = 0; lcfg->magic = 0; isc_mem_put(mctx, lcfg, sizeof(*lcfg)); } void isc_log_registercategories(isc_log_t *lctx, isc_logcategory_t categories[]) { isc_logcategory_t *catp; REQUIRE(VALID_CONTEXT(lctx)); REQUIRE(categories != NULL && categories[0].name != NULL); /* * XXXDCL This somewhat sleazy situation of using the last pointer * in one category array to point to the next array exists because * this registration function returns void and I didn't want to have * change everything that used it by making it return an isc_result_t. * It would need to do that if it had to allocate memory to store * pointers to each array passed in. */ if (lctx->categories == NULL) { lctx->categories = categories; } else { /* * Adjust the last (NULL) pointer of the already registered * categories to point to the incoming array. */ for (catp = lctx->categories; catp->name != NULL;) { if (catp->id == UINT_MAX) { /* * The name pointer points to the next array. * Ick. */ DE_CONST(catp->name, catp); } else { catp++; } } catp->name = (void *)categories; catp->id = UINT_MAX; } /* * Update the id number of the category with its new global id. */ for (catp = categories; catp->name != NULL; catp++) { catp->id = lctx->category_count++; } } isc_logcategory_t * isc_log_categorybyname(isc_log_t *lctx, const char *name) { isc_logcategory_t *catp; REQUIRE(VALID_CONTEXT(lctx)); REQUIRE(name != NULL); for (catp = lctx->categories; catp->name != NULL;) { if (catp->id == UINT_MAX) { /* * catp is neither modified nor returned to the * caller, so removing its const qualifier is ok. */ DE_CONST(catp->name, catp); } else { if (strcmp(catp->name, name) == 0) { return (catp); } catp++; } } return (NULL); } void isc_log_registermodules(isc_log_t *lctx, isc_logmodule_t modules[]) { isc_logmodule_t *modp; REQUIRE(VALID_CONTEXT(lctx)); REQUIRE(modules != NULL && modules[0].name != NULL); /* * XXXDCL This somewhat sleazy situation of using the last pointer * in one category array to point to the next array exists because * this registration function returns void and I didn't want to have * change everything that used it by making it return an isc_result_t. * It would need to do that if it had to allocate memory to store * pointers to each array passed in. */ if (lctx->modules == NULL) { lctx->modules = modules; } else { /* * Adjust the last (NULL) pointer of the already registered * modules to point to the incoming array. */ for (modp = lctx->modules; modp->name != NULL;) { if (modp->id == UINT_MAX) { /* * The name pointer points to the next array. * Ick. */ DE_CONST(modp->name, modp); } else { modp++; } } modp->name = (void *)modules; modp->id = UINT_MAX; } /* * Update the id number of the module with its new global id. */ for (modp = modules; modp->name != NULL; modp++) { modp->id = lctx->module_count++; } } isc_logmodule_t * isc_log_modulebyname(isc_log_t *lctx, const char *name) { isc_logmodule_t *modp; REQUIRE(VALID_CONTEXT(lctx)); REQUIRE(name != NULL); for (modp = lctx->modules; modp->name != NULL;) { if (modp->id == UINT_MAX) { /* * modp is neither modified nor returned to the * caller, so removing its const qualifier is ok. */ DE_CONST(modp->name, modp); } else { if (strcmp(modp->name, name) == 0) { return (modp); } modp++; } } return (NULL); } void isc_log_createchannel(isc_logconfig_t *lcfg, const char *name, unsigned int type, int level, const isc_logdestination_t *destination, unsigned int flags) { isc_logchannel_t *channel; isc_mem_t *mctx; unsigned int permitted = ISC_LOG_PRINTALL | ISC_LOG_DEBUGONLY | ISC_LOG_BUFFERED | ISC_LOG_ISO8601 | ISC_LOG_UTC; REQUIRE(VALID_CONFIG(lcfg)); REQUIRE(name != NULL); REQUIRE(type == ISC_LOG_TOSYSLOG || type == ISC_LOG_TOFILE || type == ISC_LOG_TOFILEDESC || type == ISC_LOG_TONULL); REQUIRE(destination != NULL || type == ISC_LOG_TONULL); REQUIRE(level >= ISC_LOG_CRITICAL); REQUIRE((flags & ~permitted) == 0); /* XXXDCL find duplicate names? */ mctx = lcfg->lctx->mctx; channel = isc_mem_get(mctx, sizeof(*channel)); channel->name = isc_mem_strdup(mctx, name); channel->type = type; channel->level = level; channel->flags = flags; ISC_LINK_INIT(channel, link); switch (type) { case ISC_LOG_TOSYSLOG: FACILITY(channel) = destination->facility; break; case ISC_LOG_TOFILE: /* * The file name is copied because greatest_version wants * to scribble on it, so it needs to be definitely in * writable memory. */ FILE_NAME(channel) = isc_mem_strdup(mctx, destination->file.name); FILE_STREAM(channel) = NULL; FILE_VERSIONS(channel) = destination->file.versions; FILE_SUFFIX(channel) = destination->file.suffix; FILE_MAXSIZE(channel) = destination->file.maximum_size; FILE_MAXREACHED(channel) = false; break; case ISC_LOG_TOFILEDESC: FILE_NAME(channel) = NULL; FILE_STREAM(channel) = destination->file.stream; FILE_MAXSIZE(channel) = 0; FILE_VERSIONS(channel) = ISC_LOG_ROLLNEVER; FILE_SUFFIX(channel) = isc_log_rollsuffix_increment; break; case ISC_LOG_TONULL: /* Nothing. */ break; default: UNREACHABLE(); } ISC_LIST_PREPEND(lcfg->channels, channel, link); /* * If default_stderr was redefined, make the default category * point to the new default_stderr. */ if (strcmp(name, "default_stderr") == 0) { default_channel.channel = channel; } } isc_result_t isc_log_usechannel(isc_logconfig_t *lcfg, const char *name, const isc_logcategory_t *category, const isc_logmodule_t *module) { isc_log_t *lctx; isc_logchannel_t *channel; REQUIRE(VALID_CONFIG(lcfg)); REQUIRE(name != NULL); lctx = lcfg->lctx; REQUIRE(category == NULL || category->id < lctx->category_count); REQUIRE(module == NULL || module->id < lctx->module_count); for (channel = ISC_LIST_HEAD(lcfg->channels); channel != NULL; channel = ISC_LIST_NEXT(channel, link)) { if (strcmp(name, channel->name) == 0) { break; } } if (channel == NULL) { return (ISC_R_NOTFOUND); } if (category != NULL) { assignchannel(lcfg, category->id, module, channel); } else { /* * Assign to all categories. Note that this includes * the default channel. */ for (size_t i = 0; i < lctx->category_count; i++) { assignchannel(lcfg, i, module, channel); } } /* * Update the highest logging level, if the current lcfg is in use. */ if (lcfg->lctx->logconfig == lcfg) { sync_highest_level(lctx, lcfg); } return (ISC_R_SUCCESS); } void isc_log_write(isc_log_t *lctx, isc_logcategory_t *category, isc_logmodule_t *module, int level, const char *format, ...) { va_list args; /* * Contract checking is done in isc_log_doit(). */ va_start(args, format); isc_log_doit(lctx, category, module, level, false, format, args); va_end(args); } void isc_log_vwrite(isc_log_t *lctx, isc_logcategory_t *category, isc_logmodule_t *module, int level, const char *format, va_list args) { /* * Contract checking is done in isc_log_doit(). */ isc_log_doit(lctx, category, module, level, false, format, args); } void isc_log_write1(isc_log_t *lctx, isc_logcategory_t *category, isc_logmodule_t *module, int level, const char *format, ...) { va_list args; /* * Contract checking is done in isc_log_doit(). */ va_start(args, format); isc_log_doit(lctx, category, module, level, true, format, args); va_end(args); } void isc_log_vwrite1(isc_log_t *lctx, isc_logcategory_t *category, isc_logmodule_t *module, int level, const char *format, va_list args) { /* * Contract checking is done in isc_log_doit(). */ isc_log_doit(lctx, category, module, level, true, format, args); } void isc_log_setcontext(isc_log_t *lctx) { isc_lctx = lctx; } void isc_log_setdebuglevel(isc_log_t *lctx, unsigned int level) { REQUIRE(VALID_CONTEXT(lctx)); atomic_store_release(&lctx->debug_level, level); /* * Close ISC_LOG_DEBUGONLY channels if level is zero. */ if (level == 0) { RDLOCK(&lctx->lcfg_rwl); isc_logconfig_t *lcfg = lctx->logconfig; if (lcfg != NULL) { LOCK(&lctx->lock); for (isc_logchannel_t *channel = ISC_LIST_HEAD(lcfg->channels); channel != NULL; channel = ISC_LIST_NEXT(channel, link)) { if (channel->type == ISC_LOG_TOFILE && (channel->flags & ISC_LOG_DEBUGONLY) != 0 && FILE_STREAM(channel) != NULL) { (void)fclose(FILE_STREAM(channel)); FILE_STREAM(channel) = NULL; } } UNLOCK(&lctx->lock); } RDUNLOCK(&lctx->lcfg_rwl); } } unsigned int isc_log_getdebuglevel(isc_log_t *lctx) { REQUIRE(VALID_CONTEXT(lctx)); return (atomic_load_acquire(&lctx->debug_level)); } void isc_log_setduplicateinterval(isc_logconfig_t *lcfg, unsigned int interval) { REQUIRE(VALID_CONFIG(lcfg)); lcfg->duplicate_interval = interval; } unsigned int isc_log_getduplicateinterval(isc_logconfig_t *lcfg) { REQUIRE(VALID_CONTEXT(lcfg)); return (lcfg->duplicate_interval); } void isc_log_settag(isc_logconfig_t *lcfg, const char *tag) { REQUIRE(VALID_CONFIG(lcfg)); if (tag != NULL && *tag != '\0') { if (lcfg->tag != NULL) { isc_mem_free(lcfg->lctx->mctx, lcfg->tag); } lcfg->tag = isc_mem_strdup(lcfg->lctx->mctx, tag); } else { if (lcfg->tag != NULL) { isc_mem_free(lcfg->lctx->mctx, lcfg->tag); } lcfg->tag = NULL; } } char * isc_log_gettag(isc_logconfig_t *lcfg) { REQUIRE(VALID_CONFIG(lcfg)); return (lcfg->tag); } /* XXXDCL NT -- This interface will assuredly be changing. */ void isc_log_opensyslog(const char *tag, int options, int facility) { (void)openlog(tag, options, facility); } void isc_log_closefilelogs(isc_log_t *lctx) { REQUIRE(VALID_CONTEXT(lctx)); RDLOCK(&lctx->lcfg_rwl); isc_logconfig_t *lcfg = lctx->logconfig; if (lcfg != NULL) { LOCK(&lctx->lock); for (isc_logchannel_t *channel = ISC_LIST_HEAD(lcfg->channels); channel != NULL; channel = ISC_LIST_NEXT(channel, link)) { if (channel->type == ISC_LOG_TOFILE && FILE_STREAM(channel) != NULL) { (void)fclose(FILE_STREAM(channel)); FILE_STREAM(channel) = NULL; } } UNLOCK(&lctx->lock); } RDUNLOCK(&lctx->lcfg_rwl); } /**** **** Internal functions ****/ static void assignchannel(isc_logconfig_t *lcfg, unsigned int category_id, const isc_logmodule_t *module, isc_logchannel_t *channel) { isc_logchannellist_t *new_item; isc_log_t *lctx; REQUIRE(VALID_CONFIG(lcfg)); lctx = lcfg->lctx; REQUIRE(category_id < lctx->category_count); REQUIRE(module == NULL || module->id < lctx->module_count); REQUIRE(channel != NULL); /* * Ensure lcfg->channellist_count == lctx->category_count. */ sync_channellist(lcfg); new_item = isc_mem_get(lctx->mctx, sizeof(*new_item)); new_item->channel = channel; new_item->module = module; ISC_LIST_INITANDPREPEND(lcfg->channellists[category_id], new_item, link); /* * Remember the highest logging level set by any channel in the * logging config, so isc_log_doit() can quickly return if the * message is too high to be logged by any channel. */ if (channel->type != ISC_LOG_TONULL) { if (lcfg->highest_level < channel->level) { lcfg->highest_level = channel->level; } if (channel->level == ISC_LOG_DYNAMIC) { lcfg->dynamic = true; } } } /* * This would ideally be part of isc_log_registercategories(), except then * that function would have to return isc_result_t instead of void. */ static void sync_channellist(isc_logconfig_t *lcfg) { unsigned int bytes; isc_log_t *lctx; void *lists; REQUIRE(VALID_CONFIG(lcfg)); lctx = lcfg->lctx; REQUIRE(lctx->category_count != 0); if (lctx->category_count == lcfg->channellist_count) { return; } bytes = lctx->category_count * sizeof(ISC_LIST(isc_logchannellist_t)); lists = isc_mem_get(lctx->mctx, bytes); memset(lists, 0, bytes); if (lcfg->channellist_count != 0) { bytes = lcfg->channellist_count * sizeof(ISC_LIST(isc_logchannellist_t)); memmove(lists, lcfg->channellists, bytes); isc_mem_put(lctx->mctx, lcfg->channellists, bytes); } lcfg->channellists = lists; lcfg->channellist_count = lctx->category_count; } static void sync_highest_level(isc_log_t *lctx, isc_logconfig_t *lcfg) { atomic_store(&lctx->highest_level, lcfg->highest_level); atomic_store(&lctx->dynamic, lcfg->dynamic); } static isc_result_t greatest_version(isc_logfile_t *file, int versions, int *greatestp) { char *bname, *digit_end; const char *dirname; int version, greatest = -1; size_t bnamelen; isc_dir_t dir; isc_result_t result; char sep = '/'; #ifdef _WIN32 char *bname2; #endif /* ifdef _WIN32 */ /* * It is safe to DE_CONST the file.name because it was copied * with isc_mem_strdup(). */ bname = strrchr(file->name, sep); #ifdef _WIN32 bname2 = strrchr(file->name, '\\'); if ((bname != NULL && bname2 != NULL && bname2 > bname) || (bname == NULL && bname2 != NULL)) { bname = bname2; sep = '\\'; } #endif /* ifdef _WIN32 */ if (bname != NULL) { *bname++ = '\0'; dirname = file->name; } else { DE_CONST(file->name, bname); dirname = "."; } bnamelen = strlen(bname); isc_dir_init(&dir); result = isc_dir_open(&dir, dirname); /* * Replace the file separator if it was taken out. */ if (bname != file->name) { *(bname - 1) = sep; } /* * Return if the directory open failed. */ if (result != ISC_R_SUCCESS) { return (result); } while (isc_dir_read(&dir) == ISC_R_SUCCESS) { if (dir.entry.length > bnamelen && strncmp(dir.entry.name, bname, bnamelen) == 0 && dir.entry.name[bnamelen] == '.') { version = strtol(&dir.entry.name[bnamelen + 1], &digit_end, 10); /* * Remove any backup files that exceed versions. */ if (*digit_end == '\0' && version >= versions) { result = isc_file_remove(dir.entry.name); if (result != ISC_R_SUCCESS && result != ISC_R_FILENOTFOUND) { syslog(LOG_ERR, "unable to remove " "log file '%s': %s", dir.entry.name, isc_result_totext(result)); } } else if (*digit_end == '\0' && version > greatest) { greatest = version; } } } isc_dir_close(&dir); *greatestp = greatest; return (ISC_R_SUCCESS); } static void insert_sort(int64_t to_keep[], int64_t versions, int64_t version) { int i = 0; while (i < versions && version < to_keep[i]) { i++; } if (i == versions) { return; } if (i < versions - 1) { memmove(&to_keep[i + 1], &to_keep[i], sizeof(to_keep[0]) * (versions - i - 1)); } to_keep[i] = version; } static int64_t last_to_keep(int64_t versions, isc_dir_t *dirp, char *bname, size_t bnamelen) { int64_t to_keep[ISC_LOG_MAX_VERSIONS] = { 0 }; int64_t version = 0; if (versions <= 0) { return (INT64_MAX); } if (versions > ISC_LOG_MAX_VERSIONS) { versions = ISC_LOG_MAX_VERSIONS; } /* * First we fill 'to_keep' structure using insertion sort */ memset(to_keep, 0, sizeof(to_keep)); while (isc_dir_read(dirp) == ISC_R_SUCCESS) { char *digit_end = NULL; char *ename = NULL; if (dirp->entry.length <= bnamelen || strncmp(dirp->entry.name, bname, bnamelen) != 0 || dirp->entry.name[bnamelen] != '.') { continue; } ename = &dirp->entry.name[bnamelen + 1]; version = strtoull(ename, &digit_end, 10); if (*digit_end == '\0') { insert_sort(to_keep, versions, version); } } isc_dir_reset(dirp); /* * to_keep[versions - 1] is the last one we want to keep */ return (to_keep[versions - 1]); } static isc_result_t remove_old_tsversions(isc_logfile_t *file, int versions) { isc_result_t result; char *bname = NULL, *digit_end = NULL; const char *dirname = NULL; int64_t version, last = INT64_MAX; size_t bnamelen; isc_dir_t dir; char sep = '/'; #ifdef _WIN32 char *bname2; #endif /* ifdef _WIN32 */ /* * It is safe to DE_CONST the file.name because it was copied * with isc_mem_strdup(). */ bname = strrchr(file->name, sep); #ifdef _WIN32 bname2 = strrchr(file->name, '\\'); if ((bname != NULL && bname2 != NULL && bname2 > bname) || (bname == NULL && bname2 != NULL)) { bname = bname2; sep = '\\'; } #endif /* ifdef _WIN32 */ if (bname != NULL) { *bname++ = '\0'; dirname = file->name; } else { DE_CONST(file->name, bname); dirname = "."; } bnamelen = strlen(bname); isc_dir_init(&dir); result = isc_dir_open(&dir, dirname); /* * Replace the file separator if it was taken out. */ if (bname != file->name) { *(bname - 1) = sep; } /* * Return if the directory open failed. */ if (result != ISC_R_SUCCESS) { return (result); } last = last_to_keep(versions, &dir, bname, bnamelen); /* * Then we remove all files that we don't want to_keep */ while (isc_dir_read(&dir) == ISC_R_SUCCESS) { if (dir.entry.length > bnamelen && strncmp(dir.entry.name, bname, bnamelen) == 0 && dir.entry.name[bnamelen] == '.') { char *ename = &dir.entry.name[bnamelen + 1]; version = strtoull(ename, &digit_end, 10); /* * Remove any backup files that exceed versions. */ if (*digit_end == '\0' && version < last) { result = isc_file_remove(dir.entry.name); if (result != ISC_R_SUCCESS && result != ISC_R_FILENOTFOUND) { syslog(LOG_ERR, "unable to remove " "log file '%s': %s", dir.entry.name, isc_result_totext(result)); } } } } isc_dir_close(&dir); return (ISC_R_SUCCESS); } static isc_result_t roll_increment(isc_logfile_t *file) { int i, n, greatest; char current[PATH_MAX + 1]; char newpath[PATH_MAX + 1]; const char *path; isc_result_t result = ISC_R_SUCCESS; REQUIRE(file != NULL); REQUIRE(file->versions != 0); path = file->name; if (file->versions == ISC_LOG_ROLLINFINITE) { /* * Find the first missing entry in the log file sequence. */ for (greatest = 0; greatest < INT_MAX; greatest++) { n = snprintf(current, sizeof(current), "%s.%u", path, (unsigned)greatest); if (n >= (int)sizeof(current) || n < 0 || !isc_file_exists(current)) { break; } } } else { /* * Get the largest existing version and remove any * version greater than the permitted version. */ result = greatest_version(file, file->versions, &greatest); if (result != ISC_R_SUCCESS) { return (result); } /* * Increment if greatest is not the actual maximum value. */ if (greatest < file->versions - 1) { greatest++; } } for (i = greatest; i > 0; i--) { result = ISC_R_SUCCESS; n = snprintf(current, sizeof(current), "%s.%u", path, (unsigned)(i - 1)); if (n >= (int)sizeof(current) || n < 0) { result = ISC_R_NOSPACE; } if (result == ISC_R_SUCCESS) { n = snprintf(newpath, sizeof(newpath), "%s.%u", path, (unsigned)i); if (n >= (int)sizeof(newpath) || n < 0) { result = ISC_R_NOSPACE; } } if (result == ISC_R_SUCCESS) { result = isc_file_rename(current, newpath); } if (result != ISC_R_SUCCESS && result != ISC_R_FILENOTFOUND) { syslog(LOG_ERR, "unable to rename log file '%s.%u' to " "'%s.%u': %s", path, i - 1, path, i, isc_result_totext(result)); } } n = snprintf(newpath, sizeof(newpath), "%s.0", path); if (n >= (int)sizeof(newpath) || n < 0) { result = ISC_R_NOSPACE; } else { result = isc_file_rename(path, newpath); } if (result != ISC_R_SUCCESS && result != ISC_R_FILENOTFOUND) { syslog(LOG_ERR, "unable to rename log file '%s' to '%s.0': %s", path, path, isc_result_totext(result)); } return (ISC_R_SUCCESS); } static isc_result_t roll_timestamp(isc_logfile_t *file) { int n; char newts[PATH_MAX + 1]; char newpath[PATH_MAX + 1]; const char *path; isc_time_t now; isc_result_t result = ISC_R_SUCCESS; REQUIRE(file != NULL); REQUIRE(file->versions != 0); path = file->name; /* * First find all the logfiles and remove the oldest ones * Save one fewer than file->versions because we'll be renaming * the existing file to a timestamped version after this. */ if (file->versions != ISC_LOG_ROLLINFINITE) { remove_old_tsversions(file, file->versions - 1); } /* Then just rename the current logfile */ isc_time_now(&now); isc_time_formatshorttimestamp(&now, newts, PATH_MAX + 1); n = snprintf(newpath, sizeof(newpath), "%s.%s", path, newts); if (n >= (int)sizeof(newpath) || n < 0) { result = ISC_R_NOSPACE; } else { result = isc_file_rename(path, newpath); } if (result != ISC_R_SUCCESS && result != ISC_R_FILENOTFOUND) { syslog(LOG_ERR, "unable to rename log file '%s' to '%s.0': %s", path, path, isc_result_totext(result)); } return (ISC_R_SUCCESS); } isc_result_t isc_logfile_roll(isc_logfile_t *file) { isc_result_t result; REQUIRE(file != NULL); /* * Do nothing (not even excess version trimming) if ISC_LOG_ROLLNEVER * is specified. Apparently complete external control over the log * files is desired. */ if (file->versions == ISC_LOG_ROLLNEVER) { return (ISC_R_SUCCESS); } else if (file->versions == 0) { result = isc_file_remove(file->name); if (result != ISC_R_SUCCESS && result != ISC_R_FILENOTFOUND) { syslog(LOG_ERR, "unable to remove log file '%s': %s", file->name, isc_result_totext(result)); } return (ISC_R_SUCCESS); } switch (file->suffix) { case isc_log_rollsuffix_increment: return (roll_increment(file)); case isc_log_rollsuffix_timestamp: return (roll_timestamp(file)); default: return (ISC_R_UNEXPECTED); } } static isc_result_t isc_log_open(isc_logchannel_t *channel) { struct stat statbuf; bool regular_file; bool roll = false; isc_result_t result = ISC_R_SUCCESS; const char *path; REQUIRE(channel->type == ISC_LOG_TOFILE); REQUIRE(FILE_STREAM(channel) == NULL); path = FILE_NAME(channel); REQUIRE(path != NULL && *path != '\0'); /* * Determine type of file; only regular files will be * version renamed, and only if the base file exists * and either has no size limit or has reached its size limit. */ if (stat(path, &statbuf) == 0) { regular_file = S_ISREG(statbuf.st_mode) ? true : false; /* XXXDCL if not regular_file complain? */ if ((FILE_MAXSIZE(channel) == 0 && FILE_VERSIONS(channel) != ISC_LOG_ROLLNEVER) || (FILE_MAXSIZE(channel) > 0 && statbuf.st_size >= FILE_MAXSIZE(channel))) { roll = regular_file; } } else if (errno == ENOENT) { regular_file = true; POST(regular_file); } else { result = ISC_R_INVALIDFILE; } /* * Version control. */ if (result == ISC_R_SUCCESS && roll) { if (FILE_VERSIONS(channel) == ISC_LOG_ROLLNEVER) { return (ISC_R_MAXSIZE); } result = isc_logfile_roll(&channel->destination.file); if (result != ISC_R_SUCCESS) { if ((channel->flags & ISC_LOG_OPENERR) == 0) { syslog(LOG_ERR, "isc_log_open: isc_logfile_roll '%s' " "failed: %s", FILE_NAME(channel), isc_result_totext(result)); channel->flags |= ISC_LOG_OPENERR; } return (result); } } result = isc_stdio_open(path, "a", &FILE_STREAM(channel)); return (result); } ISC_NO_SANITIZE_THREAD bool isc_log_wouldlog(isc_log_t *lctx, int level) { /* * Try to avoid locking the mutex for messages which can't * possibly be logged to any channels -- primarily debugging * messages that the debug level is not high enough to print. * * If the level is (mathematically) less than or equal to the * highest_level, or if there is a dynamic channel and the level is * less than or equal to the debug level, the main loop must be * entered to see if the message should really be output. */ if (lctx == NULL) { return (false); } int highest_level = atomic_load_acquire(&lctx->highest_level); if (level <= highest_level) { return (true); } if (atomic_load_acquire(&lctx->dynamic)) { int debug_level = atomic_load_acquire(&lctx->debug_level); if (level <= debug_level) { return (true); } } return (false); } static void isc_log_doit(isc_log_t *lctx, isc_logcategory_t *category, isc_logmodule_t *module, int level, bool write_once, const char *format, va_list args) { int syslog_level; const char *time_string; char local_time[64]; char iso8601z_string[64]; char iso8601l_string[64]; char level_string[24] = { 0 }; struct stat statbuf; bool matched = false; bool printtime, iso8601, utc, printtag, printcolon; bool printcategory, printmodule, printlevel, buffered; isc_logchannel_t *channel; isc_logchannellist_t *category_channels; isc_result_t result; REQUIRE(lctx == NULL || VALID_CONTEXT(lctx)); REQUIRE(category != NULL); REQUIRE(module != NULL); REQUIRE(level != ISC_LOG_DYNAMIC); REQUIRE(format != NULL); /* * Programs can use libraries that use this logging code without * wanting to do any logging, thus the log context is allowed to * be non-existent. */ if (lctx == NULL) { return; } REQUIRE(category->id < lctx->category_count); REQUIRE(module->id < lctx->module_count); if (!isc_log_wouldlog(lctx, level)) { return; } local_time[0] = '\0'; iso8601l_string[0] = '\0'; iso8601z_string[0] = '\0'; RDLOCK(&lctx->lcfg_rwl); LOCK(&lctx->lock); lctx->buffer[0] = '\0'; isc_logconfig_t *lcfg = lctx->logconfig; category_channels = ISC_LIST_HEAD(lcfg->channellists[category->id]); /* * XXXDCL add duplicate filtering? (To not write multiple times * to the same source via various channels). */ do { /* * If the channel list end was reached and a match was * made, everything is finished. */ if (category_channels == NULL && matched) { break; } if (category_channels == NULL && !matched && category_channels != ISC_LIST_HEAD(lcfg->channellists[0])) { /* * No category/module pair was explicitly * configured. Try the category named "default". */ category_channels = ISC_LIST_HEAD(lcfg->channellists[0]); } if (category_channels == NULL && !matched) { /* * No matching module was explicitly configured * for the category named "default". Use the * internal default channel. */ category_channels = &default_channel; } if (category_channels->module != NULL && category_channels->module != module) { category_channels = ISC_LIST_NEXT(category_channels, link); continue; } matched = true; channel = category_channels->channel; category_channels = ISC_LIST_NEXT(category_channels, link); int_fast32_t dlevel = atomic_load_acquire(&lctx->debug_level); if (((channel->flags & ISC_LOG_DEBUGONLY) != 0) && dlevel == 0) { continue; } if (channel->level == ISC_LOG_DYNAMIC) { if (dlevel < level) { continue; } } else if (channel->level < level) { continue; } if ((channel->flags & ISC_LOG_PRINTTIME) != 0 && local_time[0] == '\0') { isc_time_t isctime; TIME_NOW(&isctime); isc_time_formattimestamp(&isctime, local_time, sizeof(local_time)); isc_time_formatISO8601ms(&isctime, iso8601z_string, sizeof(iso8601z_string)); isc_time_formatISO8601Lms(&isctime, iso8601l_string, sizeof(iso8601l_string)); } if ((channel->flags & ISC_LOG_PRINTLEVEL) != 0 && level_string[0] == '\0') { if (level < ISC_LOG_CRITICAL) { snprintf(level_string, sizeof(level_string), "level %d: ", level); } else if (level > ISC_LOG_DYNAMIC) { snprintf(level_string, sizeof(level_string), "%s %d: ", log_level_strings[0], level); } else { snprintf(level_string, sizeof(level_string), "%s: ", log_level_strings[-level]); } } /* * Only format the message once. */ if (lctx->buffer[0] == '\0') { (void)vsnprintf(lctx->buffer, sizeof(lctx->buffer), format, args); /* * Check for duplicates. */ if (write_once) { isc_logmessage_t *message, *next; isc_time_t oldest; isc_interval_t interval; size_t size; isc_interval_set(&interval, lcfg->duplicate_interval, 0); /* * 'oldest' is the age of the oldest * messages which fall within the * duplicate_interval range. */ TIME_NOW(&oldest); if (isc_time_subtract(&oldest, &interval, &oldest) != ISC_R_SUCCESS) { /* * Can't effectively do the * checking without having a * valid time. */ message = NULL; } else { message = ISC_LIST_HEAD(lctx->messages); } while (message != NULL) { if (isc_time_compare(&message->time, &oldest) < 0) { /* * This message is older * than the * duplicate_interval, * so it should be * dropped from the * history. * * Setting the interval * to be to be longer * will obviously not * cause the expired * message to spring * back into existence. */ next = ISC_LIST_NEXT(message, link); ISC_LIST_UNLINK(lctx->messages, message, link); isc_mem_put( lctx->mctx, message, sizeof(*message) + 1 + strlen(message->text)); message = next; continue; } /* * This message is in the * duplicate filtering interval * ... */ if (strcmp(lctx->buffer, message->text) == 0) { /* * ... and it is a * duplicate. Unlock the * mutex and get the * hell out of Dodge. */ goto unlock; } message = ISC_LIST_NEXT(message, link); } /* * It wasn't in the duplicate interval, * so add it to the message list. */ size = sizeof(isc_logmessage_t) + strlen(lctx->buffer) + 1; message = isc_mem_get(lctx->mctx, size); message->text = (char *)(message + 1); size -= sizeof(isc_logmessage_t); strlcpy(message->text, lctx->buffer, size); TIME_NOW(&message->time); ISC_LINK_INIT(message, link); ISC_LIST_APPEND(lctx->messages, message, link); } } utc = ((channel->flags & ISC_LOG_UTC) != 0); iso8601 = ((channel->flags & ISC_LOG_ISO8601) != 0); printtime = ((channel->flags & ISC_LOG_PRINTTIME) != 0); printtag = ((channel->flags & (ISC_LOG_PRINTTAG | ISC_LOG_PRINTPREFIX)) != 0 && lcfg->tag != NULL); printcolon = ((channel->flags & ISC_LOG_PRINTTAG) != 0 && lcfg->tag != NULL); printcategory = ((channel->flags & ISC_LOG_PRINTCATEGORY) != 0); printmodule = ((channel->flags & ISC_LOG_PRINTMODULE) != 0); printlevel = ((channel->flags & ISC_LOG_PRINTLEVEL) != 0); buffered = ((channel->flags & ISC_LOG_BUFFERED) != 0); if (printtime) { if (iso8601) { if (utc) { time_string = iso8601z_string; } else { time_string = iso8601l_string; } } else { time_string = local_time; } } else { time_string = ""; } switch (channel->type) { case ISC_LOG_TOFILE: if (FILE_MAXREACHED(channel)) { /* * If the file can be rolled, OR * If the file no longer exists, OR * If the file is less than the maximum * size, (such as if it had been renamed * and a new one touched, or it was * truncated in place) * ... then close it to trigger * reopening. */ if (FILE_VERSIONS(channel) != ISC_LOG_ROLLNEVER || (stat(FILE_NAME(channel), &statbuf) != 0 && errno == ENOENT) || statbuf.st_size < FILE_MAXSIZE(channel)) { (void)fclose(FILE_STREAM(channel)); FILE_STREAM(channel) = NULL; FILE_MAXREACHED(channel) = false; } else { /* * Eh, skip it. */ break; } } if (FILE_STREAM(channel) == NULL) { result = isc_log_open(channel); if (result != ISC_R_SUCCESS && result != ISC_R_MAXSIZE && (channel->flags & ISC_LOG_OPENERR) == 0) { syslog(LOG_ERR, "isc_log_open '%s' " "failed: %s", FILE_NAME(channel), isc_result_totext(result)); channel->flags |= ISC_LOG_OPENERR; } if (result != ISC_R_SUCCESS) { break; } channel->flags &= ~ISC_LOG_OPENERR; } FALLTHROUGH; case ISC_LOG_TOFILEDESC: fprintf(FILE_STREAM(channel), "%s%s%s%s%s%s%s%s%s%s\n", printtime ? time_string : "", printtime ? " " : "", printtag ? lcfg->tag : "", printcolon ? ": " : "", printcategory ? category->name : "", printcategory ? ": " : "", printmodule ? (module != NULL ? module->name : "no_module") : "", printmodule ? ": " : "", printlevel ? level_string : "", lctx->buffer); if (!buffered) { fflush(FILE_STREAM(channel)); } /* * If the file now exceeds its maximum size * threshold, note it so that it will not be * logged to any more. */ if (FILE_MAXSIZE(channel) > 0) { INSIST(channel->type == ISC_LOG_TOFILE); /* XXXDCL NT fstat/fileno */ /* XXXDCL complain if fstat fails? */ if (fstat(fileno(FILE_STREAM(channel)), &statbuf) >= 0 && statbuf.st_size > FILE_MAXSIZE(channel)) { FILE_MAXREACHED(channel) = true; } } break; case ISC_LOG_TOSYSLOG: if (level > 0) { syslog_level = LOG_DEBUG; } else if (level < ISC_LOG_CRITICAL) { syslog_level = LOG_CRIT; } else { syslog_level = syslog_map[-level]; } (void)syslog( FACILITY(channel) | syslog_level, "%s%s%s%s%s%s%s%s%s%s", printtime ? time_string : "", printtime ? " " : "", printtag ? lcfg->tag : "", printcolon ? ": " : "", printcategory ? category->name : "", printcategory ? ": " : "", printmodule ? (module != NULL ? module->name : "no_module") : "", printmodule ? ": " : "", printlevel ? level_string : "", lctx->buffer); break; case ISC_LOG_TONULL: break; } } while (1); unlock: UNLOCK(&lctx->lock); RDUNLOCK(&lctx->lcfg_rwl); }